Open-hearth furnace



Mmh z, 1926. 1,574,797

G. L. DANFORTH, JR

OPEN HEARTH FURNAGE Filed July 5I 1924 2 Sheets-Sheet 1 March 2 1926u l 1,574,797

- G. L. DANFORTH, JR,

OPENV HEARTH FURNACE Filed July 5, 1924 y 2 Sheets-Shea?l 2 .www A Patented Mar. 2, 1926.

UNITED STATES time? PATENT OFFICE.

GEORGE L.` DANIEORTH, JR., OF CHICAGO, ILLINOIS, ASSIGNOR T0 OPEN HEARTH COMBUSTION COMPANY, OF CHICAGO, ILLINOISLA CORPORATION OF DELAWARE.

OBEN-HEARTH FURNACE.

Application led July 5i,

To (171 1c/mm. fit may concern:

Be it known that I, Gnouun Il. DANron'rH, Jr., a citizen ofthe United States, residing at Chicago7 in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Open-Hearth Furnaces, of which the following is a specification.

This invention relates to a new and improved open hearth furnace and more particularly to an open hearth furnace. of the damper type.

Open hearth furnaces are double ended and the products of combustion alternately pass out opposite ends. Consequently in lixed cnd furnaces the port design has to be a compromise between that most satis-factory for introducing the gas and air and that most satisfactory for carrying away .the products of combustion. In order to provide a more etiicient port design furnaces have been made with auxiliary ports adaptcd to carryolf the products of combustion, but provided with dampcrs to close them ott' on the incoming end ef the furnace. In this way a small incoming port area may be provided so that adequate direction and velocity may be given the flame while ade quate outgoing port area may be provided for carrying out the products of combustion without the resistance due to small passages.

In certain types of furnaces having auxiliary .ports controlled by dampers, the gas uptakes have been comparatively small and the gas has been introduced at comparatively high velocit-y. Such a vconstruction gives a maximum amount of mixture Vwith the air-in the port with consequent large amount of combustion in the port. 'lhis has resulted in a correspondiv'ig shortage of combustion in the chamber and also has required an excessive amount of water cooling. Another detrimental eil'eet of the small gas up take lies in the fact that but a small portion of the products of combustion are carried through the port and consequently the heating cll'cct upon the gas regcnerator checkerwork is very materially less than that upon the air regenerator eheckerwork.

Itis an object of the present invention to provide a new and improved furnace construction in which auxiliary outgoing ports are provided and in which the gas in introduced into the incoming portthrough an 1924. Serial No. 724,362.

uptake of comparatively large area whereby the gas may be introduced at relatively low It is a furthe object to provide a furnace of this type in which the air uptakes discharge behind the lateral dampers and behind the discharge of the gas uptake into the incoming port.

Other and further objects Will appear as the description proceeds I have illustrated a preferred embodiment of my invention in the accompanying drawings, in which- Figure 1 is a vertical section of the furnace end; h

Figure 2 is a section taken on line 2-2 of Figure 1; and v Figure 3 is a section taken on line 3--3 of Figure 2.

The incoming port l1. is located opposite the center of the furnace hearth 10. This port is defined by thc'vertically extending longitudinal walls ,12 which are located upon either side of the entrance of the gas uptake 13 into the bottom of the port. The lateral outgoing ports 1-1 are defined between Walls 12 and the side wallsl of the furnace. T he dampers 16 connect the rear ends ofthe Walls 12 with the side walls of the furnace and close oil' the rear ends of the lateral ports 14. y

The air uptakes 17 discharge luto the end of the'furnace immediately in the rear of the dampers 16. These uptakes 17 are located laterally of the gas uptake 13 and in the rear of it. It will be noted that the damper-s 16 are approxiinately in the plane of the rear end of the opening ofthe gas uptake 13 into the incoming port. y

The dampers 16 are provided with the watereooled frame 1S and rest against the water cooled guides 19. The dampers are operated vertically by means of cable 20 passing over pulley 2l and may be draun up into the housing 22 entirely out of the furnace.

The walls 12 are provided with suitable Water cooling means 23. The heel 24 of the gas uptake opening is also provided with Water cooled means 25.

It will he observed that the opening ot the gas uptake into the port is comparatively large and that the gas may he introduced at relatively low velocity. The air eoniing up through the uptakes 1T is caused to move laterally by the, tlainpers lt which are immediately ni the front ot the uptakes and the air is directed out over the heel il and intersects the stream of gas from the gas uptake. 'lhis lconstruction atl'orde adequate mixture between the ai and the gas so that not sutlicient flame is generated in the Lport to hurn away the port and yet so that Ithe maximum heating ellect is on the incoming side ot' the hath in the furnacey chamber. The llame does not extend l'ar enough to burn aw'ay the ports on the outgoing end.

On the outgoing ends the dampers tu are raised and the products of combustion pass out both through the lateral ports and the incoming port. It will he apparent. from Figure l that the greater amount ot the products ot combustion passing through port ll Will go down through the gas uptake 13 and will serve to heat the gas regenerator.

One preferred form of luy invention has been shown by way of illustration only and I contemplate such changes and modifications to meetV varying conditions, as may come Within the spirit and scope of the appended claims.

I claim:

1. VIn an open hearth furnace, a eent rally located gas uptake opening into the furnace end at a. point in advance of the end wall. vertically extending longitudinal walls located adjacent the sides of the gas uptake opening, dampers adapted to close the side ports formed between the longitudinal walls:

and the furnace side Walls, and air uptakes opening into the furnace in the rear of tlnx dempers.

2. In an open hearth furnace, a centrally located gas uptake opening into the furnace end at a point in advance ofv the end wall, vertically extending longitudinal walls located adjacent the side of the gars uptake opening. dampers adapted to close the side ports formed hetween the longitudinal wallal and the lurnace side walls. the dampers heilig located in approximately the plane ol' the rear end oll they longitudinal walls. and air uptakeal opening into the t'urnace iu the rear oll the dampers.

il. lu au open hearth luulaee. a centrally located gas uptake opening into'the l'urnaee end at' a point iu advance ol' the end wall. vertically extending longitudinal walls lo cated adjacent the side oll the gas uptake opening. dainpers adapted to clo-e the lside ports lormcd lletween the longitudinal walls and the l'urnace side walls. the dainpers laing located approximately the plane ol' the rear end ol' the longitudinal walls and ol` the rear edge ol` the gas uptake opening. and air uptakes opening into the l'urnace in the rear oll the dampers l. ln an open hearth l'urnace, a centrally located gas uptake opening into the l'urnace end at a point in advance olt the end wall. vertically extending longitudinal walls lo cated adjacent the side ol' the gas uptake. opening'. and extending l'rom approximately the rear edge otA the openingr to a point yin advance olI the front edge tltereol'. air up` takes located rearwardly and laterally ot the gaa uptakes. and dampers adapted to cloee4 the openings hetween thc .eide walls' and longitudinal walls.

5. ln an open hearth furnace. a centrally located gas uptake opening into the, furnace end at a point in advance ot' the end wall, vertically extending longitudinal walls' located adjacentl the side of the gas uptake opening'. and extending from approximately the rear edge ol the opening to a pointV in advance ol the l'ront edge thereof. air uptakee located yrearwardly and laterally of the gas uptakes. and damperis adapted to close the openings hetwecn the side walls and longitudinal walls, the dampers extending' in approximately the plane of the rear edge ol' the gas uptake opening.

Signed at Chicago, Illinois, this 25th day June. 1924.

GEORGE L. DANFORTH, Jn.

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